Add ability to allow to embed AutoIt interpreter into C++ code

[DmitryKa]

Propose to allow to embed the AutoIt INTERPRETER into C++ code, something like:

AU3_API void WINAPI AU3_Eval(LPWSTR szAutoItBasicScript);

So, I want to execute an AutoIt script from C++ (this script may be hard-coded into S++ string or read from any file, no matter).

Possibly - in AutoItX, possibly - in a new AutoItE (I understand that the interpreter code may be large, but it is not a big problem).

Corresponding forum topics:
​http://www.autoitscript.com/forum/index.php?showtopic=119728
​http://www.autoitscript.com/forum/index.php?showtopic=108872&st=0&p=766950&hl=interpreter&fromsearch=1&#entry766950

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